747 Cargolux emergency landing

[heavylanding]

A 747 Cargolux stuck on the runway at Findel Airport Luxembourg
few missing wheels on the main gear and hydraulic spillage

[treadigraph]

https://twitter.com/chrivoge/status/1657808731189526530?s=20

[BFSGrad]

Right main body gear truck oscillating on touchdown with subsequent departure?

[heavylanding]

A 747 Cargolux stuck on the runway at Findel Airport Luxembourg
few missing wheels on the main gear and hydraulic spillage

Cargolux would like to confirm that one of its aircraft, B747-400F bearing registration mark LX-OCV, suffered a significant landing incident at Luxembourg airport on Sunday evening at 18:52. The aircraft was unable to retract its landing gear on take-off from Luxembourg. As a result, it was forced to safely dump fuel in order to return to land at the airport. On its landing role its right body landing gear detached from the aircraft. The aircraft however came to a controlled stop and was attended to by the emergency services. No persons on board nor on the ground suffered any injuries. The relevant authorities have been informed of the incident. The aircraft remains on the runway and recovery efforts are underway.

[PoppaJo]

Good reminder around the dangers re loose objects which have the ability to be a missile as such. That gear would be at least 3T, those folks making the video will be lucky it wasn’t headed towards them.

Noted that on a airshow video recently. Aircraft misjudged a manoeuvre, came very close to the ground, wasn’t the aircraft as such that became the issue, was the loose objects on the ground afterwards which got swept up and became projectiles.

[KRviator]

Is it me, or does the right body gear seem to be at a different angle to the left prior to touchdown?

[JanetFlight]

Is it me, or does the right body gear seem to be at a different angle to the left prior to touchdown?
You are right...not to the left but the tilt was different from the other side (the correct one), hence the unability to retract and broken after TD...per this clip »»»

https://twitter.com/i/status/1657835372057964544

[Rebus]

That is some lump to be bouncing along the tarmac. One wheel unit is heavy enough but 4 plus brake units and the truck:ooh:.

[DIBO]

some damage close-ups
https://twitter.com/airplusnews/status/1657845217070915585

[nicolai]

From the comments we can also learn how to say "We can fix that with some speed tape" in French ( c'est réparable avec du duck tape non? )

[offa]

It's easy to be smart after the event but surely we should not have any unnecessary vehicles or light aircraft at close-in holding points during a planned emergency landing involving 300+ tons of heavy metal? Just a thought for ATC? Revert to at least LoViz procedures? No aircraft or passenger bus would survive a collision with 3 or 4 tons of gear.

[lincman]

Seems to me the torque links for that body gear broke/came undone during to T/O roll resulting in the bogey angle being out of what and preventing gear retraction and finally, severe truck shimmy and leaving the aircraft. Also a common defect with NLGs on many different aircraft types. Good job the 747 has four main gears!.

[Rebus]

Seems to me the torque links for that body gear broke/came undone during to T/O roll resulting in the bogey angle being out of what and preventing gear retraction and finally, severe truck shimmy and leaving the aircraft. Also a common defect with NLGs on many different aircraft types. Good job the 747 has four main gears!.
Good job it was a body gear and not a wing gear, otherwise No. 4 engine would be scraping the ground.

[XL189]

Looks like CLX the same aircraft had a heavy landing a few weeks back

(3) Cargolux 747-400 KABLAMMO!-SMASH AND GO 15 Apr 2023 - YouTube

LX-OCV

Thanks BFS Grad & hans brinker...
I stand corrected!

[BFSGrad]

Looks like the same aircraft had a heavy landing a few weeks back

LX-OCV
The 4/15/2023 #2 pod strike incident was LX-ECV.

[Luc Lion]

Here are 2 incident reports which are worth reading.

The first is about an incident which concerned the very same aircraft and the very same right body gear back on January 21st, 2010.
The aircraft landed on a van.
This is very probably completely unrelated to the present incident, but the coincidence that it concerns the very same landing gear bogie is funny.
https://reports.aviation-safety.net/2010/20100121-2_B744_LX-OCV.pdf

The second incident is a Virgin Atlantic aircraft.
The landing gear concerned is a wing gear but the sequence of events bears some similarities.
It can be noticed that the circumstances that permitted the mistake are still existing today.
https://assets.publishing.service.gov.uk/media/56162bc040f0b6585f000005/Boeing_747-443_G-VROM_10-15.pdf
https://aerossurance.com/safety-management/747-installation-error/

I bet that several people will have a very thorough look at the gear and gear door actuators of LX-OCV.

[hans brinker]

From the comments we can also learn how to say "We can fix that with some speed tape" in French ( c'est réparable avec du duck tape non? )

"bande adhésive de grande vitesse" s'il vous plaît

[hans brinker]

Looks like the same aircraft had a heavy landing a few weeks back, LX-OCV

The 4/15/2023 #2 pod strike incident was LX-ECV.

Not a good month for CLX

[atakacs]

Does anyone remember a similar incident with a 747 (whatever type)?

[tubby linton]

The VS aircraft was a hydraulic problem. Having spoken to a B747-400 pilot who watched the same incident the comment was that the handling pilot had forgotten about the reduced elevator effectiveness in the flare due to the hydraulic failure. It also explained why only part of the undercarriage extended.

[tubby linton]

Does anyone remember a similar incident with a 747 (whatever type)? I can remember a restriction on nosewheel steering angle on A330/340 aircraft due to excessive wear from pivoting around one leg on turnrounds.

[Buster Hyman]

A testament to the skill of the engineers & designers of the 747 this!

not too sure I’d like to see it happen to a 777F though… 🤔

[atakacs]

I can remember a restriction on nosewheel steering angle on A330/340 aircraft due to excessive wear from pivoting around one leg on turnrounds.
To the point of severing the landing gear ?

[DaveReidUK]

To the point of severing the landing gear ?

I would imagine the point of the restriction was to avoid that possibility.

[Tom Sawyer]

To the point of severing the landing gear ?
Seem to remember that the A340 steering restrictions came in after this Sabena incident https://aviation-safety.net/database/record.php?id=19980829-1 .....which did sheer the MLG.

As for the CargoLux....just wondering if it could be a tilt actuator failure or failure of supply pressure to it so the gear presented at incorrect angle on touchdown?

[atakacs]

So as far as the 747 is concerned this seems to be a pretty unique incident?

[offa]

Seem to remember that the A340 steering restrictions came in after this Sabena incident https://aviation-safety.net/database/record.php?id=19980829-1 .....which did sheer the MLG.

As for the CargoLux....just wondering if it could be a tilt actuator failure or failure of supply pressure to it so the gear presented at incorrect angle on touchdown?
Tilt actuator fail likely compounded by uphill slope on RWY06

[aeromech3]

For those above, note:- B747 main Wing gear has tilt actuator, and body gear, has body gear steering actuators!

[Tom Sawyer]

For those above, note:- B747 main Wing gear has tilt actuator, and body gear, has body gear steering actuators!
It is getting on 20 years since I really worked the 74, but there is a body gear truck positioning actuator which fulfills the tilt actuator purpose on the forward side of the bogie. To what extent a failure may cause a situation as under discussion, I'm not sure. Certain that if the BLG is not tilted, it prevents all gear retraction, so there must be a tilt actuator function to ensure this, hence the truck position actuator?
As you mentioned the BLG steering system, I guess it is also feasible that a yoke failure or disconnection, or an actuator structural failure could possibly cause the bogie to present at the wrong angle.
Like I said, been a while so I maybe incorrect?

[aeromech3]

Revision of B747 main landing gears

https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/285x496/b747bodygear_449a1a626d6543e62765cdc021cf056c46b8097b.png
https://cimg1.ibsrv.net/gimg/pprune.org-vbulletin/495x335/bodygearactuators1_16efa331993e497d7df7c35cbce645aa0306f4aa. png
https://cimg3.ibsrv.net/gimg/pprune.org-vbulletin/723x274/b747maingears_9364d2eb6d206f72086a95acedabaf09d18861a8.png

[aeromech3]

All be it a -400 schematic

https://cimg0.ibsrv.net/gimg/pprune.org-vbulletin/567x517/bodygeartilt_d467944153be2ff8a0e1f318bfbc036df79a6b97.png

[CV880]

Truck vs Bogie. As far as I know only Boeing refers to this as truck. Every other manufacturer (Douglas, Lockheed, Convair, Airbus) called it a Bogie.
Looking at the pictures in the AvHerald a couple of things standout.
1. In the view of the bogie in the grass the inner cylinder of the shock absorber is clearly fractured. Also the upper end of the lower torque link is ruptured where it connected to the spindle that connected it to the steering actuators.
2. In the picture of the rear of the RH Body gear the steering actuators are intact as is the vertical pin that connects the actuators to the spindle that in turn connects to the lower torque link. Said spindle appears to be intact with the nut that secures the lower torque link still in place. The spindle is now hanging vertically.
I have never heard of either of these parts fracturing before and the spindle appears to be complete so if the torque links did not became disconnected what initiated such a huge failure? I doubt a truck positioner fault could cause such a failure mode.

[ballpoint]

The steel alloy the landing gear is made of is very sensitive to hydrogen.
When hydrogen molecules penetrate the material, which can happen when the chrome coating is damaged, a phenomenon called Hydrogen Brittleness will occur.
This causes tension and subsequent cracking of the part.

My educated guess is failure of the gear inner cylinder, preventing gear retraction after T/O.